SpringCloudAlibaba-Nacos

概述和版本说明

<spring.boot.version>3.2.0spring.boot.version>
<spring.cloud.version>2023.0.0spring.cloud.version>
<spring.cloud.alibaba.version>2022.0.0.0spring.cloud.alibaba.version>

注册中心，配置中心及动态刷新广播通知

Spring Cloud Alibaba 参考文档 (spring-cloud-alibaba-group.github.io)

下载安装使用

Release 2.2.3 (May 25th, 2023) · alibaba/nacos (github.com)

D:\tool\nacos-server-2.2.3\nacos\bin>startup.cmd -m standalone

服务注册中心

provider

<dependency>
  <groupId>com.alibaba.cloudgroupId>
  <artifactId>spring-cloud-starter-alibaba-nacos-discoveryartifactId>
dependency>

server:
  port: 9001
spring:
  application:
    name: nacos-pay-provider
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848 nacos地址

@SpringBootApplication
@EnableDiscoveryClient
public class Main9001 {

    public static void main(String[] args) {
        SpringApplication.run(Main9001.class, args);
    }
}

@RestController
public class PayAlibabaController {

    @Value("${server.port}")
    private String serverPort;

    @GetMapping("/pay/nacos/{id}")
    public String getPayInfo(@PathVariable("id") Integer id) {
        return "nacos registry serverPost: " + serverPort + ", id: " + id;
    }
}

consumer

需要额外添加 load-balance 依赖

server:
  port: 9000
spring:
  application:
    name: nacos-order-consume
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848 nacos地址

service-url:
  nacos-user-service: http://nacos-pay-provider

配置 RestTemplate

@RestController
public class OrderController {

    @Resource
    private RestTemplate restTemplate;

    @Value("${service-url.nacos-user-service}")
    private String serverURL;

    @GetMapping("/order/pay/nacos/{id}")
    public String paymentInfo(@PathVariable("id") Integer id) {
        return restTemplate.getForObject(serverURL + "/pay/nacos/" + id, String.class);
    }

}

-DServer.port=9002

GET http://localhost:9000/order/pay/nacos/112 测试负载均衡 端口 9001 9002 交替出现

服务配置中心和动态刷新

<dependency>
  <groupId>org.springframework.cloudgroupId>
  <artifactId>spring-cloud-starter-bootstrapartifactId>
dependency>
<dependency>
  <groupId>com.alibaba.cloudgroupId>
  <artifactId>spring-cloud-starter-alibaba-nacos-configartifactId>
dependency>
<dependency>
  <groupId>com.alibaba.cloudgroupId>
  <artifactId>spring-cloud-starter-alibaba-nacos-discoveryartifactId>
dependency>

也是需要 bootstrap

spring:
  application:
    name: nacos-config-client
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848
      config:
        server-addr: localhost:8848
        file-extension: yaml

@RestController
@RefreshScope // 支持动态刷新功能
public class NacosConfigClientController {

    @Value("${config.info}")
    private String configInfo;

    @GetMapping("/config/info")
    public String getConfigInfo() {
        return configInfo;
    }
}

nacos 中配置匹配规则

nacos-config-client-dev.yaml

测试接口和动态刷新

ps: nacos 历史配置回滚功能

Nacos数据模型 Namespace-Group-DataId三元组

解决多项目多环境配置问题

DataId 方案

使用默认 Namespace 默认 Group

不同 DataId，使用服务名+环境名来区分

Group 方案

通过Group实现环境区分，默认 Namespace

新建 group PROD_GROUP 的配置

Namespace 环境区分

新建命名空间 Prod_Namespace，不填写id，会自动生成